> Or when they built their own GPS system and it ended up being far more accurate than any other system in use?

It took 20 years to deploy 30 satellites. You can call that a success I guess.

> The world's largest passenger aircraft

That is an Airbus project which is not an EU project. Airbus is the result of a merger between multiple companies and was not initiated by the EU.

> The weight loss drugs keeping American celebrities thin?

This drug is manufactured in Denmark by a Danish company. It has nothing to do with the EU.

> The first mRNA Covid-19 vaccine?

You mean the Pfizer vaccine? That's a German company, not an initiative from the EU.

> Or when they built the world's most powerful particle collider and discovered the Higgs boson?

They did build the CERN ... in 1954. Which we can agree was a long time ago. Since then the ability of the EU to deliver big projects such as for example Ariane 6 has gone down rather quickly. Also you ll notice that when the CERN was created, the EU as we know it today did not exist.

> Or when they built their own Earth observation system and it was also better than anyone elses? Or when they built their own weather monitoring constellation and forecast model and it ended up superior to all others?

Ok and so what? Does that invalidate my arguments? A few successes amongst a ton of failures. That does not inspire any confidence.

That is why I am skeptical but I am prepared to eat my own words if the EU has a complete up and running constellation of 300 satellites in orbit by 2035.

The EU has some great companies for sure but these companies did not get there because the EU helped them or because the EU decreed that such companies have to exists.